Composition of matter



A Patented Mar. 15, 1927.

UNITED STATES PATENT. oFnc-E.

ROBERTSON P. DBUMMOND, LOS ANGELES, CALIFORNIA, ASSIGNOR. TO TAGIII'C CAST IRON PIPE & FOUNDRY COMPANY, OF LOS- ANGELES, CALIFORNIA, A QOBPORA'IION' OF CALIFORNIA.

composrrron or MATTER.

No Drawing.

This invention relates to a process and method of forming and producing special alloy metal. In particular the invention relates to an alloy metal which is more abrasive in nature than shock-resisting. The 'invention has .for an object the provision of a metal which will prove superior to present known metals where great abrasive action is necessary, such as in all grinding and crushing work, and .more particularly as mill liners. crusher jaws, disc grinders, roll grinders, cement mills and gyratory crushers. Another object is the provision of a metal which has remarkable wearing qualities without being brittle.

. Another object is the provision of. a metal which will not mean. p

A further object is the provision of a metal which will give 25% more wear than manganese steel in all castings for abrasive purposes. A further object is the provision of a metal alloy which is magnetic. 1

The metal can: readily be made largely from waste metals such as old tin cans, automobile fenders, galvanized cuttings and clippings and steel turningsas well as out ofscrap steel in any form. The metal is melted as in ordinary steel practice and the neo- 0 essary alloy elements-added. The analysis of the metal is as follows:

Per cent. Carbon. 1.75 to 2 Manganese 6.25 to 8 Silicon 1.50 to 2 'Phosphorus .03 to .06 H Sulphur .01 to .03

The remaining percentage to make 100 per 40 cent is of course niade up by the use of iron. At first sight it may appear that a metal containing the combination of ingredients above set forth would be worthless, but the whole combination gives a structure contain- Application filed August 7,- 1925. serial No. 48,880.

so far' as the inventor is aware no other metal will show. pearlitc and martinsite together with the production ofthe martinsite without the usual quenching. In onelparticular the metal of the invention is what may be termed a contradictory metal because from a metallurgical standpoint a manganese vcontent of between 6.25% to 8%. is the weakest point of manganese in steel. A silicon content of 1.50% to 2% -is also a dangerous point in true steel, while a carbon content at 2% is dangerous. The whole combination, however, gives a metal which is very valuable for the purpose intended.

I have found that the metal can be conveniently made within the limits of the percentages given for the various alloy elements in the analysis. I I

Having thus disclosed my invention, I

claim and desire to secure by Letters Patent: 1. A new composition of matter, comprising in combination: iron, carbon 1.75 to 2%,

manganese 6.25 to 8%,

2. A new composit on of matter. comprising, in combination: iron, carbon 1.75 to 2%,

manganese 6.25 to 8%, silicon 1.50 to 2%,

and phosphorus .03 to 06%.

1 3. A new composition of,'matter,comprisand silicon 1.50 to ing, in combination: iron carbon1.75 to 2%,

manganese 6.25 to 8%. silicon 1.50 to 2%, phosphorus .03 to .06%, and sulphur .01. to .0374.

In testimony whereof, I have signed, my.

name to this specification.

ROBERTSON DRUMMOND. 

